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                [Usaco2008 Feb]Line连线游戏                </h1>
                <p>时间限制：5s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">Farmer John最近发明了一个游戏，来考验自命不凡的贝茜。游戏开始的时 候，FJ会给贝茜一块画着N (2 &lt;= N &lt;= 200)个不重合的点的木板，其中第i个点 的横、纵坐标分别为X_i和Y_i (-1,000 &lt;= X_i &lt;=1,000； -1,000 &lt;= Y_i &lt;= 1,000)。 贝茜可以选两个点画一条过它们的直线，当且仅当平面上不存在与画出直线 平行的直线。游戏结束时贝茜的得分，就是她画出的直线的总条数。为了在游戏 中胜出，贝茜找到了你，希望你帮她计算一下最大可能得分。 </span></p></p><hr/><h3>输入格式</h3><p><p><span style="font-size: medium">* 第1行: 输入1个正整数：N</span></p>
<p><span style="font-size: medium">&nbsp;* 第2..N+1行: 第i+1行用2个用空格隔开的整数X_i、Y_i，描述了点i的坐标 </span></p></p><hr/><h3>输出格式</h3><p><p><span style="font-size: medium">第1行: 输出1个整数，表示贝茜的最大得分，即她能画出的互不平行的直线数 </span></p></p><hr/><h3>样例输入</h3><pre>4
-1 1
-2 0
0 0
1 1
</pre><hr/><h3>样例输出</h3><pre>* 第1行: 输出1个整数，表示贝茜的最大得分，即她能画出的互不平行的直线数

</pre><hr/><h3>提示</h3><p><p>4 输出说明: 贝茜能画出以下4种斜率的直线：-1，0，1/3以及1。</p></p><hr/><h3>题目来源</h3><p>Silver</p>
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